Polymorphisms of Cx 3 CR1 and CXCR6 Receptors in Relation to HAART Therapy of HIV Type 1 Patients

The chemokine polymorphisms CXCR6-3E/K, In1.1T/C, H7 haplotype, CX₃CR1-V249I, and CX₃CR1-T280M have been shown to affect the course of HIV infection. We studied their influence on immunologic and virologic response to HAART in a group of 143 HIV-1 patients. We performed Kaplan–Meier analysis using the following end-point criteria: (1) time from HAART initiation to undetectable viral load (VL < 50 copies/ml), (2) maximum duration of viral suppression, (3) time from HAART administration until CD4 elevation above 200 cells/μl for patients with baseline CD4 below 200 cells/μl and above 500 cells/μl for patients with baseline CD4 between 200 and 500 cells/μl, respectively, and (4) time from HAART initiation until CD4 reduction below baseline values. Our results revealed an improved immunologic response to HAART in patients with the CX₃CR1-249I or CX₃CR1-280M allele. On the contrary, patients with initial VL suppression due to HAART showed a faster virologic failure in the presence of the CXCR6-3K allele. The In1.1T/C polymorphism and H7 haplotype did not reveal any specific effect on HAART response.